CAJ | 학술논문

提出一种有机朗肯循环太阳能热发电辅助燃煤电厂碳捕集系统，该系统利用聚焦式太阳能驱动有机朗肯循环(Organic rankine cycle，ORC)发电系统，ORC系统高温冷凝热为燃煤电厂醇胺法CO2捕集系统提供热量，ORC热利用效率理论上达到100%。该系统避免了传统碳捕集系统汽轮机抽汽，保证了燃煤电厂的稳定运行和经济效益。对新型碳捕集系统的热力学性能参数进行设计匹配，筛选适用于高温ORC太阳能热发电系统的有机工质，备选工质为甲苯、辛烷、硅油MDM及环乙烯。对新型碳捕集系统及抽汽式碳捕集系统进行经济性分析与比较，计算均化成本、碳捕获成本和净现值。结果显示：在碳捕获率小于90%时，新型碳捕集系统均化成本更高；新型碳捕集系统较之抽汽式系统碳捕获成本更高，约为抽汽式系统碳捕获成本的2倍；当太阳能热发电补贴电价超过1.18元/(kW·h)时，新型碳捕集系统具有更高的经济性，当太阳能热发电补贴电价低于0.82元/(kW·h)时，抽汽式碳捕集系统具备更高的经济性，当太阳能热发电补贴电价处于两者之间时，新型碳捕集系统与抽汽式碳捕集系统的经济性高低取决于燃煤电厂的碳捕获率。
제출일충유궤랑긍순배태양능열발전보조연매전엄탄포집계통，해계통이용취초식태양능구동유궤랑긍순배(Organic rankine cycle，ORC)발전계통，ORC계통고온냉응열위연매전엄순알법CO2포집계통제공열량，ORC열이용효솔이론상체도100%。해계통피면료전통탄포집계통기륜궤추기，보증료연매전엄적은정운행화경제효익。대신형탄포집계통적열역학성능삼수진행설계필배，사선괄용우고온ORC태양능열발전계통적유궤공질，비선공질위갑분、신완、규유MDM급배을희。대신형탄포집계통급추기식탄포집계통진행경제성분석여비교，계산균화성본、탄포획성본화정현치。결과현시：재탄포획솔소우90%시，신형탄포집계통균화성본경고；신형탄포집계통교지추기식계통탄포획성본경고，약위추기식계통탄포획성본적2배；당태양능열발전보첩전개초과1.18원/(kW·h)시，신형탄포집계통구유경고적경제성，당태양능열발전보첩전개저우0.82원/(kW·h)시，추기식탄포집계통구비경고적경제성，당태양능열발전보첩전개처우량자지간시，신형탄포집계통여추기식탄포집계통적경제성고저취결우연매전엄적탄포획솔。
A carbon capture system applied in coal-fired power plant assisted by solar organic rankine cycle (ORC) for power generation is studied;the ORC system is driven by concentrated solar energy for power generation, the heat of condensation is for carbon capture system using MEA applied in coal-fired power plant, which makes thermal efficiency of ORC 100%theoretically. The system guarantees stable operation and high benefit of the coal-fired power plants via avoiding steam extraction from steam turbine. ORC working fluid candidates are selected based on thermodynamic analysis and parameter design of the system. Toluene, octane, silicone oil MDM and cyclohex are four candidate ORC working fluid. Economic analysis and comparison between different carbon capture systems are conducted based on levelized cost of electricity (LCOE), cost of carbon (COC) and net present value (NPV). When carbon capture rate is less than 90%, LCOE of proposed system is higher than that of traditional carbon capture based on steam extraction. COC of new system is higher than that of traditional one, approximately twice. The new system has higher NPV than that of normal one when subsidy electricity price for concentrated solar power (CSP) is higher than 1.18 CNY/(kW·h), otherwise, if subsidy electricity price for (CSP) is lower than 0.82 CNY/(kW·h), traditional system has higher NPV, and it depends on carbon capture rate to decide which system has better economy when subsidy electricity price is between them.